Circuit breaker



FIG. 1 is a front, top, right side and front perspective view of a first embodiment of a circuit breaker showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevation view thereof;

FIG. 7 is a right side elevation view thereof;

FIG. 8 is a top, right side and front perspective view of a second embodiment of the circuit breaker of FIGS. 3 through 7 showing my new design; and,

FIG. 9 is a top, right side and front perspective view of a third embodiment of the circuit breaker of FIGS. 3 through 7 showing my new design. 

The ornamental design for a circuit breaker, as shown and described. 